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] geneous.

NlTEl) STATES KARL JOHN S NDSTROM, or EUSrIo,

ASSIGNMENTS, TO ,THE AMERICAN ron'orrE POWDER MANUFACTURING COMPANY, 0E NEW'YORK, N. v

AsTl NG SPECIFICATION forming part of Letters Patent No. 370,025, dated September NEW JERSEY, ASSIGNOB, BY M sNE" =POWDER,

, Application filed May 7, 1886. Serial No; 201,443, (No specimens.)

. I I To (all whom, it may concern:

Heretofore what are called low-percent ageblastingpowders have been prepared by mixing togetherin a double bottomed orjacketed vessel heated by steam at a pressure of at least one hundred pounds per square inch, sulphur, soft coal, and nitrate of soda; but that method of preparation.does'nnot give a penfectly homogeneous product, and'has often resulted in explosions, owing to the excessive heat employed; v 1

The objects of this invention are to avoid all danger in the manufacture of such powder, to increase its poweryand to make it more homo To attain these objects, I moisten the nitrate of soda, ground to the very finest powder, with wood-tar in which has been previously dissolved as much rosin-as is possible without too much thickening the tar; I then add to this mass, in any suitable vessel, a solution of sulphur in a volatile solvent, as carbon bisulphide, and mix the whole by stirring with wooden paddles, or by the use of any other suitable mixing device or apparatus, This process is or may be performed at the temperature of 50 centigrade.

The solution of sulphurin carbon bisulphide is easily dissolved in the tar, and thus constitutes, with the nitrate of soda, a; perfectly homogeneous mixture which in a-few minutes ness. To this-powder from five to eight per cent. of nitro-glycerine maybe added for making it more highly explosive; or,by,addingcoal of any. kind to the powder, the violence of its explosiveness may be diminished to suit the various demands for astrong but slowlyexploding blasting-powder. Y

The proportions of the several ingredients employed in carrying out my invention may be to some extent varied without materially changing the character of my product; but I prefer to usethem in the proportions, by weight,

as follows: nitrate of soda, three hundred and seventy parts; wood-tar, thirty-eight parts; rosin, thirty-two parts; sulphur, ,fifty parts;

carbon bisulphide, tenparts. A striking advantage of my process of manufacture of the powder compound is that I get a pe'rfeotly'liomogeneous mixture without dange'rously heating it during the preparation.

I am aware that tar and oleaginous matters v have been mixed with powder for the purpose 6o ,of rendering it non-explosive in theopen air iand from friction; and concussion; and I am also aware that it is not new, broadly considered, to treat potassium nitrate witha splution do not claim, broadly, the above steps .inthe 4 7 manufacture .of powder as of my invention;

The nitrate of sodawhich I employ rapidly absorbs. moisture, and to prevent this Local: it with wood-tar and rosin to form a coating impervious to moisture. Coaltar-wlould' n0t'-. answer the purpose,- because the benzole which it containswoulddissolve the sulphur after= ward added and destroy the homogeneity of the product; i he employment of rosin prevents the stickiness due to the tar and causes the powder to run freely, which it might not do if tar alonewere used. The absence of charcoal in my-powder'reduces its tendency to absorb moisture. The tar and rosin formaooat 8o ing which is impervious to moisture, and hence the nitrate ofsodais prevented. from deterioration. When the sulphur solution is added to nitrate of soda so'coated, the carbon bisulleaving thenitrate of soda coated or varnished with tar and sulphur, which. thereafter pro- 1. The within-described processof preparing a blasting-powder compound, consisting of sulphur in carbon bisulphiddf'a'ndhen ce 1-65' 'phide dissolves the tar'and then evaporates,

tects the particles from moisture, and atthe as my invention, and desire to 5 in moistening nitrate of soda with a solution of wood-tar. and rosin, whereby a coating is formed; thereon which is impervious to moist 2. A blasting-powder mixture composed of 10 vnitrate of soda coated o'r impregnated with wood-tar, rosin, and sulphur, in the pr0p0ruge, and addingto and mixing with the nitrate tions substantially as herein set forth.

5 o soda so coated a solution of sulphur in a p r volatile solvent, whereby the tar is dissolved KARL JOHN SUNDSTRUM and an intimate combination of the sulphur Witnesses: v

and nitrate produced, substantially as herein MAIILoN PITSEY,

" FRANK H. TIPPETT. 

